Portable pneumatic rotary drill.



' No. 7|0 ,7s2. Patented Oct. 7, I902.

J. KELLER.

PORTABLE PNEUMATIC ROTARY DRILL.

(Application filed Aug. 13, 1902.

2 Sheets-$heel I.

(No Model.)

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No. 7|0,782. Patented Oct. 7, I902.

J. KELLER.

- PORTABLE PNEUMATIC ROTARY DRILL.

(Application filed Aug. 18, 1902.)

(lo Model.)

{Shani-Sheet 2,

UNITE STATES PATENT Farce,

JULIUS KELLER, OF'PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO PHILADELPHIAPNEUMATIC TOOL COMPANY, A CORPORATION OF NEE? JERSEY.

PORTABLE PNEUMATEC ROTARY DRlLL.

SPECIFICATION forming part of Letters Patent No. 710,782, dated October'7, 1902.

Application filed August 13, 1902. Serial No. 119,479. (N model.)

To all 1071/0717, it may concern:

Be it known that I, JULIUS KELLER, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvement in Portable Pneumatic RotaryDrills, of which the following is a specifica tion.

My invention relates to improvements in various particulars in theconstruction of portable pneumatic rotary drills, wherein I employ arotary engine and a novel construction of a reversing-valve, which islocated intermediate of the inlet-passage for the motive fluid and saidrotary engine, said reversing-valve directing the exhaust of the motivefluid downwardly into an exhaust-chamber located below theenginecylinder, while the lower portion of the casing of said exhaustchamber serves to support within it a chuck or tool holder.

It also consists of a novel manner of as sembling the rotary engine,reversing-valve, exhaust-chamber, and the holder, whereby a very compactform of tool is produced, and I am thus enabled to dispense with theemployment of a boring-spindle, and consequently do not have to providea journalbearing for said boring-spindle upon the engine-cylinder, ashas been heretofore done in devices of this character.

It also consists of novel features of construction, all as will behereinafter fully set forth, and particularly pointed out in the claims.

Figure 1 represents a side elevation, partly in section, of a portablepneumatic rotary drill embodying my invention. Fig. 2 represents asection on line a; :r, Fig. 1.

Similar numerals of reference indicate cor responding parts in thefigures.

Referring to the drawings, the motive fluid enters through the passage 1and the ports 2 when the sleeve 3 is in the position seen in Fig. 2 andpasses thence through the passage 4 around the groove 5 of thereversing-valve 6 and thence into the chamber 7and port 8. The impact ofthe motive fluid upon the blades 9 causes the latter and their adjunctsto revolve, as will be understood by those skilled in this art, and thisrotation is imparted to the extension 10, pinion 11, and idlers 12,which latter mesh with an internal stationary rack 13, which is retainedbetween the upper and lower sections lat and 15,- which inclose theexhaust-chamber1(5, said section 14: serving to support theengine-cylinder and rotary engine therein.

17 designates yokerpins upon which the idlers are mounted, saidyoke-pins engaging the yoke 18, whichis mounted upon the ballbearings19.

2O designates the chuck or tool -socket. which is held in position bythe nut 21, the extension 22 of the yoke being held in position by thenuts 23. The motive fluid when the ports are in the position seen inFig. 2 revolves the engine from left to right and passes through theport 2st into the chamber 25 and thence into the ports 26 of the hollowcylindrical reversing-valve 6 and downwardly through the latter into theexhaust-chamber 16 through the outlet 27, the final exhaust to theatmosphere taking place through the port 28. The rotary sleeve 3 servesas a handle for manipulating the drill while in operation, anddiametrically opposite thereto is located the handle 29, which issimplya hollow piece of tubing screwed or otherwise secured into theengine-cylinder 30, said handle having no exhaust passing therethrough.The reversing-valve has its lower portion 31 rotatably mounted in thetop 32 of the upper section or cover 14: of the exhaust-chamber 16,while the upper portion of said reversingvalve has an extension 33, towhich the handie 34 is secured, said handle being deflected downwardly,so as to be in convenient reach of the operator.

35 designates the feeding device,which consists of the threaded stem 36,which is secured to the head 37 in the top of the engine cylinder, saidstem being engaged by the sleeve or female member 38, which is providedwith the handles 39 and the center 40. If desired, a breast-feed (notshown) maybe employed, the same being interchangeable with the screw orforce feed.

I make no claim herein to the screw or force feed, as it is a commonright to supply feeding devices of this character in portable drills ofthis kind or to make the sameinterchangeable with a breast-feed, ifdesired. Neither do I herein-make any claim to the utilization of ahandle to conduct the motive fluid to the drill, since it is a commonright to do this or to utilize an opposite handle for the exit of theexhaust, as in the patent to Leach, No. 244,629, granted July 19, 1881.

I am aware that it has heretofore been proposed to provide a rotaryengine adapted to drilling or boring with a reversing-valve, as in thepatent to Noteman, No. 273,136, granted February27, 1883, and myinvention therefore consists more particularly in the novel combinationof a reversing-valve in a particular location with respect to its rotaryengine and exhaust-chamber thereunder.

While my improved drill is especially adapted for metal boring ordrilling, it is equally well adapted for wood-boring, as the same areanalogous, and it is a fact that more power is required sometimes inboring certain kinds of wood than in ordinary metal-drillin g.

I make no claim to the specific form of rotary engine or specificconstruction of gearing, since the same are patented in a prior patentgranted to me, No. 646,702, granted April 3, 1900, and the presentinvention consists more particularly in the novel manner, broadly, ofassembling the rotary engine, the inlet-passage, reversing-valve, andexhaustchamber, whereby a compact and efficient portable drill isproduced.

I desire, further, to call especial attention to the fact that I employno boring-spindle in connection with my improved drill, since I dispensewith such construction entirely, and consequently have no occasion toprovide a journal-bearing for a boring-spindle upon my engine-cylinder.It will thus be seen that I employ simply a tool holder or chuck 20,which is simply mounted within the lower section 15 of theexhaust-chamber, said section being in no way connected with theengine-cylinder, so that upon the removal of said lower section all theparts are accessible for the purpose of inspection or repairs, and themotor can be employed for other uses, if desired.

I am aware of the prior constructions such as seen in the patent toMofiet, No. 369,120, granted August 30, 1887, wherein a boringspindle isemployed having a long bearing upon the engine-cylinder at one sidethereofand to none of these prior art devices do I herein make my claim.

It will be apparent that various changes may be made by those skilled inthe art which will come within the scope of my invention, and I do not,therefore, desire to be limited in every instance to the exactconstruction herein shown and described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a portable pneumatic drill, a cylin der, a rotary engine therein,an inlet-passage for the motive fluid, a plurality of chambersintermediate said passage and engine, an upright reversing-valvearranged parallel to the axis of said engine and located intermediate ofsaid passage and chambers, and an exhaust-chamber below said cylinder,said reversing valve exhausting downwardly directly into saidexhaust-chamber, and serving to simultaneously connect either of saidpassages with the inlet-passage and the other with the exhaust-chamber.

2. In a portable pneumatic drill, a cylinder, a rotaryengine therein, aninlet-passage for the motive fluid, a plurality of chambers intermediatesaid passage and engine, an upright reversing-valve arranged parallel tothe axis of said engine and located intermediate of said passage andchambers, and an exhaust-chamber below said cylinder, said reversingvalve exhausting downwardly directly into said exhaust-chamber, andserving to simultaneously connect either of said passages with theinlet-passage and the other with the exhaust-chamber, in combinationwith a chuck, rotatably supported upon means exterior to theengine-cylinder and power-transmission devicesintermediate said rotaryengine and chuck.

3. In a portable pneumatic drill, a cylinder, a rotary engine therein,an inlet-passage for the motive fluid, a plurality of chambersintermediate said passage and engine, an upright reversing-valvearranged parallel to the axis of said engine and located intermediate ofsaid passage and chambers, and an exhaust-chamber below said cylinder,said reversing valve exhausting downwardly directly into saidexhaust-chamber, and serving to simultaneously connect either of saidpassages with the inlet-passage and the other with the exhaust-chamber,in combination with a chuck rotatably supported upon the casing of saidexhaust-chamber, and powertransmission devices intermediate said engineand chuck.

at. In a portable pneumatic drill, a cylinder, a rotary engine therein,an inlet-passage for the motive fluid, a plurality of chambersintermediate said passage and engine, a reversingvalve locatedintermediate of said passage and chambers, said valve consisting of ahollow upright cylinder, having a passage therethrough, a groove at oneside of said valve, ports on the opposite side of said valve,communicating with said passage therein, an exhaust-chamber below saidcylinder, and a port in the lower portion of said valve discharging intosaid exhaust-chamber.

5. In a portable pneumatic drill, a cylinder, a rotary engine therein,an inlet-passage for the motive fluid, a plurality of chambersintermediate said passage and engine, a reversing-valve locatedintermediate of said passages and chambers, said valve consisting of ahollow upright cylinder, having a passage therethrough, a groove at oneside of said valve, ports on the opposite side of said valvecommunicating with said passage therein, an exhaust-chamber below saidcylinder, and a port in the lower portion of said valve discharging intosaid exhaust-chamber, in combination with a tool-holder, mounted in thelower portion of said exhaust-chamber and power-transmission devicesintermediate said tool-holder and rotary engine.

6. In a portable pneumatic drill, a cylinder, a rotary engine therein,an inlet-passage for the motive fluid, a plurality of chambersintermediate said passage and engine, a reversing-valve locatedintermediate of said passages and chambers, said valve consisting of ahollow upright cylinder having a passage therethrough, a groove at oneside of said valve, ports on the opposite side of said valvecommunicating with said passages therein, an exhaust-chamber locatedbelow said rotary engine, a valve-bearing in the top section of saidexhaust-chamber in which said valve is mounted, a port in the lowerportion of said valve discharging into said exhaust-chamber, and ahandle on said valve whereby the latter is adapted to be operated.

7. In aportable pneumatic drill, acylinder, a rotary engine therein, aninlet-passage for the motive fluid, a plurality of chambers intermediatesaid passage and engine, a reversing-valve located intermediate of saidpassages and chambers, said valve consisting of a hollow uprightcylinder having a passage therethrough, a groove at one side of saidvalve, ports on the opposite side of said valve communicating with saidpassages therein,

an exhaust-chamber located below said r-otary engine, a valve-bearing inthe top section of said exhaust-chamber in which said valve is mounted,a port in the lower portion of said valve discharging into saidexhaustchamber and a handle on said valve whereby the latter is adaptedto be operated, in combination with a tool-holder mounted on the lowerportion of said exhaust-chamber and power transmission intermediate saidtool- 'holder and rotary engine.

8. In a portable pneumatic drill, a cylinder, a rotary engine therein,an inlet-passage for the motive fluid, a plurality of chambersintermediate said passage and engine, a reversing-valve locatedintermediate of said passages and chambers, said valve consisting of ahollow upright cylinder, having a passage therethrough, a groove at oneside of said valve, ports on the opposite side of said valve,communicating with said passage therein, an exhaust-chamber below saidcylinder, and a port in the lower portion of said valve discharging intosaid exhaust-chamber, in combination with a rotary sleeve surroundingsaid inlet-passage and serving as a handle and a tube in engagement withthe engine-cylinder and located diametrically opposite saidinletpassage, said last-mentioned tube having no communication with theinterior of said ongine-cylinder.

JULIUS KELLER.

Witn esscs:

E. HAYWARD FAIRBANKS, O. D. MCVAY.

